Postprint version. Published in Journal of the American College of Cardiology, Volume 33, Issue 7, June 1, 1999, pages 1956-1963. Copyright © 1999 Elsevier. The definitive version is available at http://dx.doi.org/10.1016/S0735-1097(99)00101-1.
NOTE: At the time of publication, the author Jason Blank was not yet affiliated with Cal Poly.